the “check engine” light is such a racket. the car knows what condition, sensor, whatever, tripped it. modern cars have screens, that can display actual words.
but no, they light a little LED in the dashboard and make you take it in for a $150 “diagnostic”.
— Steve Randy Waldman (@interfluidity) October 19, 2020
He’s right. You could display the error code and the lookup right on your display.
Hell, you could do it on my 2004 Prius.